How to call external url in jquery?

问题:

I am trying to put comments on Facebook wall using jquery.

But my ajax call not alowing external url .

can anyone explain how can we use external url with jquery ?

below is my code :

var fbUrl="https://graph.facebook.com/16453004404_481759124404/comments?access_token=my_token";

$.ajax({        
    url: fbURL ,
    data: "message="+commentdata,
    type: 'POST',
    success: function (resp) {
        alert(resp);
    },
    error: function(e){
        alert('Error: '+e);
    }  
});

its giving xmlhtttprequest error.

回答1:

All of these answers are wrong!

Like I said in my comment, the reason you're getting that error because the URL fails the "Same origin policy", but you can still us the AJAX function to hit another domain, see Nick Cravers answer on this similar question:

You need to trigger JSONP behavior with $.getJSON() by adding &callback=? on the querystring, like this:

$.getJSON("http://en.wikipedia.org/w/api.php?action=query&prop=revisions&rvprop=content&titles="+title+"&format=json&callback=?",
function(data) {
    doSomethingWith(data); 
}); 

You can test it here.

Without using JSONP you're hitting the same-origin policy which is blocking the XmlHttpRequest from getting any data back.

With this in mind, the follow code should work:

var fbURL="https://graph.facebook.com/16453004404_481759124404/comments?access_token=my_token";

$.ajax({
    url: fbURL+"&callback=?",
    data: "message="+commentdata,
    type: 'POST',
    success: function (resp) {
        alert(resp);
    },
    error: function(e) {
        alert('Error: '+e);
    }  
});

回答2:

JQuery and PHP

In PHP file "contenido.php":

<?php
$mURL = $_GET['url'];

echo file_get_contents($mURL);
?>

In html:

<script type="text/javascript" src="js/jquery/jquery.min.js"></script>
<script type="text/javascript">
    function getContent(pUrl, pDivDestino){
        var mDivDestino = $('#'+pDivDestino);

        $.ajax({
            type : 'GET',
            url : 'contenido.php',
            dataType : 'html',
            data: {
                url : pUrl
            },
            success : function(data){                                               
                mDivDestino.html(data);
            }   
        });
    }
</script>

<a href="#" onclick="javascript:getContent('http://www.google.com/', 'contenido')">Get Google</a>
<div id="contenido"></div>

回答3:

it is Cross-site scripting problem. Common modern browsers doesn't allow to send request to another url.

回答4:

google the javascript same origin policy

in a nutshell, the url you are trying to use must have the same root and protocol. so http://yoursite.com cannot access https://yoursite.com or http://anothersite.com

is you absolutely MUST bypass this protection (which is at the browser level, as galimy pointed out), consider the ProxyPass module for your favorite web server.

回答5:

I think the only way is by using internel PHP code like MANOJ and Fernando suggest.

curl post/get in php file on your server --> call this php file with ajax

The PHP file let say (fb.php):

$commentdata=$_GET['commentdata'];
$fbUrl="https://graph.facebook.com/16453004404_481759124404/comments?access_token=my_token";
curl_setopt($ch, CURLOPT_URL,$fbUrl);
curl_setopt($ch, CURLOPT_POST, 1);
// POST data here
curl_setopt($ch, CURLOPT_POSTFIELDS,
        "message=".$commentdata);

// receive server response ...
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$server_output = curl_exec ($ch);
echo $server_output;
curl_close ($ch);

Than use AJAX GET to

fb.php?commentmeta=your comment goes here

from your server.

Or do this with simple HTML and JavaScript from externel server:

Message: <input type="text" id="message">
<input type="submit" onclick='PostMessage()'>
<script>
function PostMessage() {
var comment = document.getElementById('message').value;
    window.location.assign('http://yourdomain.tld/fb.php?commentmeta='+comment)
}
</script>

回答6:

Hi url should be calling a function which in return will give response

$.ajax({
url:'function to call url',
...
...

});

try using/calling API facebook method

回答7:

Follow the below simple steps you will able to get the result

Step 1- Create one internal function getDetailFromExternal in your back end. step 2- In that function call the external url by using cUrl like below function

 function getDetailFromExternal($p1,$p2) {

        $url = "http://request url with parameters";
        $ch = curl_init();
        curl_setopt_array($ch, array(
            CURLOPT_URL => $url,
            CURLOPT_RETURNTRANSFER => true            
        ));

        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
        $output = curl_exec($ch);
        curl_close($ch);
        echo $output;
        exit;
    }

Step 3- Call that internal function from your front end by using javascript/jquery Ajax.